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I recently had the opportunity to help Kristin Norderval build a hemispherical speaker for use in the jill sigman/thinkdance production, Our Lady of Detritus, engagingly described as “a portable, interdisciplinary performance installation about trash and transcendence; a traveling grassroots campaign fueled by experimentation, green energy sources and community interaction.” The show is presented every weekend through mid-October at various locations around New York City. See here for details.

We used an Ikea salad bowl for the enclosure just like the SLOrk speakers.

Amps

We pulled 3 Dayton T-amps from their enclosures and mounted them on the inside of the bottom plate of the speaker cabinet.

Speakers

We used 6 4″ Inifinity 4022i drivers.

Volume Pots and Connectors

The Dayton amps had combination volume and power pots, so we decided to keep them rather than source and wire up a 6-position potentiometer. A little Dremel routing magic made mounting the volume pots easier than I expected. A coaxial power jack and 6-pin Neutrik XLR jack and plug rounded out the connectors.

salad bowl – top view

salad bowl – bottom view

salad bowl – detail showing Ikea part number

salad bowl and template for marking the position of the 5 “equatorial” speakers

cutting holes for speakers

We used masking tape to prevent the jigsaw from scratching the bowl

Kristin demonstrating the dispersion pattern of the enclosure

A naked Dayton T-amp with the speaker connections on top and the volume pot on the left

A Dayton T-amp before disassembly

finished hemi – with audio and power connectors on the left

finished hemi – with 3 volume pots on the left

finished hemi – top view

The speaker sounds good–punchy and more powerful than I expected, particularly considering the 4″ drivers. I’ll be building one for myself soon.